Improvement in ventilators



J. H. KARNAN. Ventilator.

Patented July 23,1872.

Ewituems:

' Specification describinganew and Improved Ventilator, invented by JOHNH. KARNAN, of Cambridgeporhin the county of Middlesex and State ofMassachusetts. My invention consists of a combination of pipes with theexhaust-pipe of a ventilator in such manner that the wind or part of itblowing against thesideof the said exhaust-pipe will be conducted intoit and discharged up and through nozzles, also outwardly over the as toincrease the draught to a very great extent. My said ventilator isapplicable to all kinds I of buildings, ships, &c.,' and to chimney orsmoke fines of any kind.

Figure 1 is a sectional elevation of my improved ventilato'r. Fig. 2 isa horizontal section on the line a; a; of Fig. 1, and Fig. 3 is ahorizontal section on' the line 2 z. A represents an exhaust tube orfine of any i kind, which I propose to provide with large holes Bthrough the sides, and with pipes D inside of it, to receive the airblowing in at said 1,- holes, and conduct it upward through nozzles E tomake blasts for increasing the draught of the exhaust pipe or flue frombelow. The

top of the said exhaust-pipe, in such manner JOHN H. KARNAN, OFOAMBRIDGEIORT, MASSACHUSETTS.

IMPROVEMENT IN VENTILATGRS.

' Specification forming part of Letters Patent No. 129,735, dated July23, 1872.

said pipes may be arranged in any order relatively to each other, but Iprefer to arrange them so that the air will be discharged between theseries next above those below.

I also propose to have the pipes D at the top, with nozzles E extendedover the top of the exhaust-pipe, as shown, or in any equivalent mannerfor further promoting the draught.

The exhaust pipe or flue may have any kind of cap F or not, aspreferred.

I. have found by practical experiment that the application of theseblasts of the external atmosphere improves the draught very much. Havingthus described my invention, I claim 'as new and desire to secure byLetters Patcut-- 1. The combination of pipes D E with the exhaust-pipeof a ventilator or a flue, substantially as specified.

2. The combination of pipes D E with the exhaust-pipe of a ventilator orflue, substantially as specified. 7 JOHN H. KARNAN.

Witnesses:

FRED. K. NoYEs, GEO. (J. OHUTE.

